RE: Scopes, Sniping and Reloading: Was new life for...

["Jim Ericson" <jericson@xxxxxxxxxx>]

Supposedly, the reason for a 1 in 7" twist is actually for the new, long
range 5.56/.223 tracer round. The bullet is longer, and needs more
stabilization. (The normal M855/SS109 should work just fine in a 1 in 9
twist - seems too, never notice much problem with my Bushmaster - not that
it has ever been fired at anything longer than 200 meters away - not too
many long rifle ranges here in my part of Ohio.)

I actually hear different things about the use of 55 grain bullets in a 1 in
7 twist - some say it's fine, others say accuracy is so bad, you can't keep
the rounds on a pie plate at 150 meters. Since I just picked up a Colt with
a 1 in 7 barrel, I may go find out for myself. :)


Interestingly enough, there are supposedly some Bushmaster M4 carbines in
military service with a 1 in 9 twist as well. (Apparently, Uncle Sam needed
a bunch of new M4s for Desert Storm, and Colt couldn't make them fast
enough.)

> -----Original Message-----
> From: Jeff Pawlowski [mailto:blackeagleblackeagle@yahoo.com]
> Sent: Thursday, April 19, 2001 9:22 AM
> To: millenniums-end-l@firedrake.org
> Subject: RE: Scopes, Sniping and Reloading: Was new life for...
>
>
> --- Jim Ericson <jericson@erinet.com> wrote:
>
> About the twist... I've been looking at a bunch of
> that recently.
>
> The 55grain needs a 1:12 twist for optimization
> The 62grain needs a 1:7 twist for optimization
> The compromise comes at 1:9 twist, which is where some
> modern firearms come in (except the M16s).
>
> M16A1 - 1:12
> M16A2/3/4 - 1:7
> AR15 Sportsters - 1:9
> HK G36 - 1:7
> Steyr AUG - 1:9
> FAMAS A1 - 1:12
> FAMAS A2 - 1:9 (Note, they all have 7,9,12 barrel
> options, this was just standard from factory)
> Sig 550/551 - 1:7
> FNC - 1:12 or 1:7 (factory order option)
> IMI Tavor - 1:7
>
>
> =====
> Jeff Pawlowski
> Millennium's End: Officially Unofficial
> http://www.millenniumsend.com
>
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